SPC 20 OPERATOR’S MANUAL
C-8 OPERATION
3. Ignition Switch:
Turn one click counter-clockwise for accessory power, one click clockwise to turn machine power
on, full right and hold to start engine. (Refer to Engine Starting Procedure) For engines with cold-
starting aid (heating plug) refer to engine operation in engine manual.
4. Engine Oil Pressure:
This gauge displays the engine oil pressure in psi. Normal operating oil pressure is: 30 – 60 psi
5. Tachometer:
Display on the digital tachometer is the current speed of the threshing cylinder in revolutions per
minute (rpm). See Cylinder / Concave Setting chart in this section for approximate cylinder speed
according to crop. Some adjustment may need to be made to cylinder speed to adjust for field and
crop conditions.
6. Forward / Reverse Hand Control:
This lever controls the hydraulic fluid flow to the drive wheels. Push the lever forward to drive the
machine forward, pull the lever back to drive the machine in reverse. Move the lever slowly and
steadily to avoid machine bucking or jerking. Center the handle to return the machine to neutral. If
the machine will not turn over, be sure that this lever is in the neutral (centered) position. The
neutral safety switch will disable the ignition switch until the hand control lever is returned to the
center position
7. Threshing Cylinder Speed:
Threshing cylinder speed is a cable controlled hydraulic drive. Change cylinder speed only when
combine is running and clutch is engaged. See the Cylinder / Concave Settings Chart for
approximate speed according to crop. Some adjustment may need to be made to cylinder speed
according to field and crop conditions. See TROUBLESHOOTING SECTION for problems involving
threshing cylinder speed.
8. Speed Control:
Push foot control stop handle down to engage the foot control stop. When stop is set it can be used
to quickly reach operating ground speed and keep a consistent speed through plots. Pull handle up
and turn to lock in the disengaged position.
FIGURE C-6 Speed Control Stop
STOP PIECE SHOWN IN TRANS-
PORT MODE ROTATE COUNTER
CLOCKWISE FOR PLOT MODE
FOR SPEED INCREASE SCREW IN
CLOCKWISE FOR SPEED DECREASE SCREW
OUT COUNTER CLOCKWISE
GREASE FITTING
CABLE TO
CONTROL KNOB
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